National parks in Marin have endured almost $1.3 million in cuts over the last three years, according to a new report issued Thursday by an environmental group.

Environment California is now urging Rep. Jared Huffman, D-San Rafael, and others to fully restore funding to the parks as the federal budget is negotiated.

"Congressman Huffman and the Bay Area congressional delegation need to fight for full funding for our national parks in the budget negotiations," said Nathan Weaver, preservation advocate for Environment California, speaking at Crissy Field in San Francisco.

While the budget deal passed in December may allow for some increase in the parks budget, it is up to congressional spending committees to decide the actual funding levels this month, Weaver said.

Huffman said he is working to provide full funding to the parks and is behind such efforts "100 percent."

"It is certainly something we have lobbied for," Huffman said Thursday. "This is definitely one of the priorities."

Environment California — a nonprofit — issued its report, "Death by a Thousand Cuts," outlining the challenges facing California's national parks as a result of funding cuts.

"At Golden Gate National Recreation Area, budget cuts have forced the superintendent to close visitor centers several days a week, reduce trash collection, and delay repairs on buildings, roads and trails," said Nathan Weaver, Preservation Advocate with Environment California. "We don't want a death by a thousand cuts for Golden Gate National Recreation Area or California's national parks."

The report shows the GGNRA has lost $873,000 over the past three years between budget reductions and the March 2013 sequestration.

"Cuts have forced the Point Reyes National Seashore to close a visitor center, to close the iconic Point Reyes Lighthouse an additional day a week, and to reduce the number of lighthouse educational programs from 16 to six over the summer," Weaver said.

Point Reyes has lost $374,000 in funding over the period, according to the report. The Muir Woods National Monument lost $22,000. Statewide, national parks lost $8 million in funding, a 13 percent reduction in funding over the period.

The report also noted the economic importance of national parks. A separate 2012 report calculated that visitors to federal parklands provided more than $400 million to Marin communities. Together, the Golden Gate National Recreation Area, Point Reyes National Seashore and Muir Woods accounted for nearly one-third of the overall $1.3 billion visitors spent in association with national parks in California, according to the peer-reviewed analysis conducted by Michigan State University for the National Park Service.